A PSA NM-MT 8 card appears to be Mint 9 at first glance. Upon closer inspection, which of the following corner imperfections is permissible for the PSA 8 grade?
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A
Four perfectly sharp corners are required.
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B
Noticeable rounding on all four corners.
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C
Slightest fraying at one or two corners.
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D
Accelerated rounding on three corners.